Drill-chuck.



PATENTED PEB. 6, 1906.

P. J. HUENSGHEID. DRILL CHUCK.

APPLICATION FILED MAIL?. 1904.

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PETER J. HONSCHEID, OF DETROIT, MICHIGAN, ASSIGNOR TO NATIONAL TWIST DRILL & TOOL COMPANY, OF DETROIT, MICHIGAN, A CORPO- RATION OF MICHIGAN.

DRILL-CHUCK..

No. 81 1,722.v

Specication'of Letters Patent.

Patented Feb. 6, 1906.

Applieationiiled March 7,1904. Serial No..197,061.

a citizen of the United States, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Im rovements in Drill-Chucks, of which the fol owing is a Specification, reference being had therein to the accompanying draw- .lhe invention relates to an improved chuck for tools of various kinds; and it consists particularly in such a chuck comprising a shank, 4a slitted cylindrical head, and a clampingsleeve; also, in the combination, with such a chuck, of a reducing-bushing adapted to be` clamped upon the tool by the clamping device of the main chuck, and in the construction, arrangement, and-combination of the various parts, all as more i'ully hereinafter described, and particularly pointed out in the claims.

In the drawin s, Figure. 1 is a vertical central lon itudina section through my im.- proved c uck, showing the reducing-bushing in position. Fi 2 is a similar section of a modilied form ol bushing, the bushing being shown in elevation. Fig. 3 is a vertical longitudinal section through the bushing shown in Fig. 2. Fig. 4 is a section on linem, Fig. 1. Fig. 5 is an end elevation of Fig. 3 showing the tapering jaws.

A represents the shank of the main chuck; B the head, Which is cylindrical in shape and has the slits C therein forming two separated members, which may be moved toward each other to act for. a clamp for the shank of an inserted tool. The means I prefer to eflect this clamping is the sleeve D, having a screwthreaded engagement with the exterior of the head and having the inclined or tapering lange E' at its outer end engaging inclined bearings at the outside'. of the forward end of the head.l With this construction it is obvious that if a tool-shank is fitted into the opening in the head and the sleeve D screwed inward the inclinedvbearing on the sleeve actvring on the incline on the head it Will cause the `two members of the head to contract and tightly clamp the tool in the chuck.

In order to clamp tools of lesser diameter in the chuck, I ma place a reducing-bushing Within the hea of the main chuck, and this reducing-bushing I may make as shown in Fig. 1, Where it is shown as comprising a shank a, preferably having a tang b adapted to engage the slot c in the4 outer end of the shank of the main chuck, and a cylindrical vhead d, having slits e complementary to the slits in the head of the main chuck. At'the outer end of this bushing is an annular iiange h, having its outer Aface inclined complementarily with the inclined bearings F on the head of the main chuck. To put this bushing in, the sleeve D is removed and then rengaged with the head, and in screwing the sleeve in- Wardly the inclined flange on the sleeve will engage the inclines on the heads of the main chuc and the bushing and contractthose heads, so as to tightly clamp the shank of an inserted tool in position. I find that thisis so effective as a clamp that it will hold a tool tightly in position even if its tang b is broken off and without requiring any Work or machinery of the shank.

Instead of the cylindrical bushin shown in Fig. 1 I may insert the bushing s own in Figs. 2 and 3, which has the usual shank andftang; but instead of having'cylindrical jaws or head it has the ta ering jaws fm, adapted to lit the grooves in tlile side of what is known as the Graham twist-drill. This bushing has the saine flange h, with the inclined bearing, as described, for the bushing shown in Fig. 1. In such a bushing as is shown in Fig. 3 it is desirable to have a stop for the end of the tool, and this I form by forming an aperture through the shank and tang leading into the space between the jaws and screw-thread4 this aperture and place therein the screw o, Fig. 3, the head of the screw being preferably iiush with the face of the tang, so that blows thereon to loosen the bushing will not injure the screw-head, the inner end of the screw projecting slightly between the jaws to act as a stop forthe tool.

What I claim as my invention is- 1. In a drill-chuck, the combination With a shank member having a lon itudinal split and `chambered cylindrical' ead portion formed with an inclined outer ed e, a bushing member having a longitudina slit -therein and a tapered head, and a sleeve havin a threaded engagement with the head an formed with 'a tapered outer end portion adapted to simultaneously en age the respective tapered ends ol the shan and bushing.

2. In a dri1l-chuck, the combination with an expansible chambered head, of a compression-sleeve having a threaded engagement IOO with the head7 and a tapered end portion enthe bushing adapted to be engaged -by saidaging the forward edge of the head, anda sleeve, whereby the sleeve on the outside of ushng within the head provided with a tathe main chuckwill contract and directly corn-A pered portion at its forward edge adapted to press the jaws of the bushing when the sleeve 1 5 5 engage the tapered parts of the sleeve." 'is moved rearward. v

3. The combination of a main chuck oon- In testimony whereof I affix my signature sisting of a shank, longitudnally-slitted headv in presence of two witnesses. and an exterior sleeve having a screw-thread- Y PETER J. HOENSCHEID. ed engagement with the head for contracting Witnesses: 1o the members of the head7 of a split reducing- JAMES WHITTEMORE,

v bushing adapted to fit the head, a bearing on JAMES P. BARRY. 

